ia186xl Innovasic Semiconductor Inc., ia186xl Datasheet - Page 43

• Manufacturer Part Number: ia186xl
• Description: 16-bit Microcontroller
• Manufacturer: Innovasic Semiconductor Inc.

IA186XL/IA188XL
16-Bit Microcontrollers
range of a properly programmed chip select, that chip select will be activated when the BIU
executes the refresh bus cycle.
4.1.7 Power-Save Control
When operating in Enhanced Mode, the IA186XL can enter a power-saving state by internally
dividing the processor clock frequency by a programmable factor. This divided frequency is also
available at the CLKOUT pin. All internal logic have their clocks slowed down by the division
factor including the Refresh Control Unit and the timers. To maintain a real time count or a
fixed DRAM refresh rate, these peripherals must be re-programmed when entering and leaving
the power-save mode.
4.2
All IA186XL integrated peripherals are controlled by 16-bit registers contained within an
internal control block of 256 bytes. The control block may be mapped into either memory or I/O
space. Internal logic will recognize control block addresses and respond to bus cycles. An offset
map of the 256-byte control register block is shown in Table 12, Internal Register Map.
4.3
Additional information on the operation and programming of the 80C186XL/80C188XL can be
found in the following Intel publications:
Peripheral Architecture
Reference Documents
80C186XL/80C188XL and 80L186XL/80L188XL 16-Bit High-Integration Embedded
Processors (272433-006)
80C186XL/80C188XL Microprocessor User’s Manual (270830-00n)
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Page 43 of 72
Preliminary Data Sheet
September 30, 2008
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